Abstract: An immortalized F2 population in rice derived from F1 hybrid between Zhenshan 97B and Minghui 63,was used to QTL mapping on effective panicle number per plant by using QTLNetwork-2.0.A total of eight QTLs were detected on 6 chromosomes.Both general heterosis and environmental interaction heterosis of effective panicle number per plant in two different environments for F1,F2 and F3 generations were predicted based on QTL effects.It was revealed that QTLs with epistatic effects were prominent contributors to the heterosis for effective panicle number per plant,suggesting that the method of heterosis prediction based on QTL mapping was a powerful tool for screening superior hybrids by means of molecular marker assisted selection.

Key words: rice, immortalized F2, effective panicle number per plant, quantitative trait locus, heterosis prediction

摘要： 以水稻杂交组合珍汕97B×明恢63所衍生的永久F2（IF2）作图群体为遗传材料，采用QTLNetwork2.0定位软件对有效穗数进行了QTL分析，共检测到8个QTL，分布于6条染色体上。同时根据有效穗数的QTL遗传效应，估算了F1、F2和F3三个杂种世代的有效穗数杂种优势，在预测普通杂种优势的同时，也对环境互作杂种优势进行了预测。上位性QTL对有效穗数杂种优势的形成有重要的贡献。表明基于QTL定位结果的杂种优势预测方法有助于分子标记辅助选育强优势组合。

关键词: 水稻, 永久F2群体, 有效穗数, 数量性状座位, 杂种优势预测